A zinc rod was dipped in $$100\text{ cm}^3$$ of $$1\text{ M}$$ copper chloride solution. After some time the molarity of $$\mathrm{Cu^{2+}}$$ ions was found to be $$0.8\text{ M}$$. If the zinc rod weighs $$20\text{ g}$$, the molarity of chloride ions is

A

2 M

B

1.5 M

C

1 M

D

0.5 M